| GOST | Paravyan N. A. // Voprosy istorii estestvoznaniia i tekhniki. – 1987. – Issue 2 C. 170-170 . |
|---|---|
| MLA | "Paravyan N. A.." Voprosy istorii estestvoznaniia i tekhniki. 2 (1987).:170-170. |
| APA | (1987). Paravyan N. A.. Voprosy istorii estestvoznaniia i tekhniki. no. 2, pp.170-170 |
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